20% Tip on $40

To calculate a 20% tip on $40, multiply the bill amount by 0.20:

$40 × 0.20 = $8.00

Add the tip to the original bill to get the total:

$40 + $8.00 = $48.00

Quick mental math tip: Move the decimal one place left to get 10% ($4.00), then double it.

Standard tipping in the United States ranges from 15% to 25% at restaurants. Here is a general guide:

• 15% — Acceptable for adequate service
• 18% — Standard for good service
• 20% — Most common tip; standard for great service
• 25%+ — Exceptional service or fine dining

For a $40 bill, tips typically range from $6.00 (15%) to $10.00 (25%).